The message routing architecture in multi site environment is always an interesting one to explore. We all know the role of routing groups and also routing group connector in exchange2003, this has been revised in fact completely modified in exchange 2007. Routing group and connectors concept has been removed in the exchange 2003. Lets us consider the below scenario for example,
Site1 – Amsterdam Main Office – subnet 10.10.0.0/16
Site2 – Auckland Branch Office – subnet 10.11.0.0/16
We can domain controller in both sites for user authentication and other domain info. We can also have DNS in both sites. So with the help of the site link (WAN link), we will be able to enable the replication b/w the sites. Now, coming to the messaging part, we have only option to use the routing group and connector for message transport b/w the sites. Since active directory sites and Exchange server routing groups are independent one, i.e. not compatible with each other.
Exchange 2007 has the new feature that Hub transport server role has been built in a manner that it will use the active directory sites for the message routing. In this case, transport hub server in Amsterdam will use the active directory site link to route the message to the hub transport server in Auckland and vice versa.
I end up here; you people can explore more in this for more detail. Hope the above is informative.
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